"Ken Vale" wrote in message
.cable.rogers.com...
Peter Reilley wrote:

Tom Gardner wrote:


You're in a rowboat in a pool and there is a concrete block in the
boat.
You drop the block into the water. Does the water level in the pool go


up,


down or remain the same?

Most people here will get this but most "normal" people won't.



Lets make it a little more complicated. Suppose the concrete block is
attached to the boat with a rope. When you throw it overboard, it
hangs from the boat rather than goes to the bottom of the pool.

Does the water level in the pool go up, down or remain the same?

How big is the rope?
Ken


For this purpose, the rope is infinitely thin and weightless.

For extra credit, consider the condition where the rope has neutral
buoyancy.

Pete.